fix: docker workflow tags

* feat: introduce structured, field logging

The logging is currently minimal and only for initial message of listening and user login attempts

* chore: major version upgarde

there was a breaking API change in 8cd6d0a585 for which the git tag was v4.0.0 but the Go SIV was missed. This commit updates the SIV and retracts the defective version of v4.1.0.

.circleci/config.yml

@@ -1,45 +0,0 @@
-version: 2
-jobs:
-  lint:
-    docker:
-      - image: golangci/golangci-lint:v1.16
-    steps:
-      - checkout
-      - run: golangci-lint run -v
-  build:
-    docker:
-      - image: circleci/golang:1.12
-    steps:
-      - checkout
-      - run: go build main.go
-  release:
-    docker:
-      - image: circleci/golang:1.12
-    steps:
-      - checkout
-      - setup_remote_docker
-      - run: docker login -u $DOCKER_USERNAME -p $DOCKER_PASSWORD
-      - run: curl -sL https://git.io/goreleaser | bash
-      - run: docker logout
-workflows:
-  version: 2
-  build-workflow:
-    jobs:
-      - lint:
-          filters:
-            tags:
-              only: /.*/
-      - build:
-          filters:
-            tags:
-              only: /.*/
-      - release:
-          context: deploy
-          requires:
-            - build
-            - lint
-          filters:
-            tags:
-              only: /^v.*/
-            branches:
-              ignore: /.*/

.github/workflows/build.yml

@@ -0,0 +1,19 @@
+name: Build
+
+on:
+  push:
+    tags:
+      - v*
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.22.x"
+      - run: go build .

.github/workflows/docker.yml

@@ -0,0 +1,69 @@
+name:  Docker
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - 'main'
+    tags:
+      - 'v*'
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+      attestations: write
+      id-token: write
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            hacdias/webdav
+            ghcr.io/hacdias/webdav
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern=v{{version}}
+            type=semver,pattern=v{{major}}
+            type=semver,pattern=v{{major}}.{{minor}}
+
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
+          push: true
+          sbom: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: ${{ steps.meta.outputs.args }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

.github/workflows/lint.yml

@@ -0,0 +1,21 @@
+name: Lint
+
+on:
+  push:
+    tags:
+      - v*
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.22.x"
+      - uses: golangci/golangci-lint-action@v6
+        with:
+          version: "v1.59"

.github/workflows/releaser.yml

@@ -0,0 +1,25 @@
+name: Releaser
+
+on:
+  push:
+    tags:
+      - '*'
+
+permissions:
+  contents: write
+
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-go@v5
+      - uses: goreleaser/goreleaser-action@v6
+        with:
+          distribution: goreleaser
+          version: '~> v2'
+          args: release --clean
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/test.yml

@@ -0,0 +1,21 @@
+name: Test
+
+on:
+  push:
+    tags:
+      - v*
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  test:
+    name: test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.22.x"
+      - name: Run test with coverage
+        run: go test -race -coverprofile=coverage.txt -covermode=atomic ./...

.gitignore

@@ -0,0 +1,2 @@
+dist/
+webdav

.goreleaser.yml

@@ -1,54 +1,55 @@
-env:
-  - GO111MODULE=on
+version: 2
 
 before:
   hooks:
+    - go mod tidy
     - go mod download
 
-build:
-  main: main.go
-  binary: webdav
-  ldflags:
-    - -s -w -X github.com/hacdias/webdav/cmd.version={{.Version}}
-  goos:
-    - darwin
-    - linux
-    - windows
-    - freebsd
-    - netbsd
-    - openbsd
-  goarch:
-    - amd64
-    - 386
-    - arm
-    - arm64
-  goarm:
-    - 5
-    - 6
-    - 7
-  ignore:
-    - goos: openbsd
-      goarch: arm
-      goarm: 6
-    - goos: freebsd
-      goarch: arm
-      goarm: 6
+builds:
+  - main: main.go
+    binary: webdav
+    flags:
+      - '-trimpath'
+    ldflags:
+      - '-X github.com/hacdias/webdav/v4/cmd.version={{.Version}}'
+    goos:
+      - darwin
+      - linux
+      - windows
+      - freebsd
+      - netbsd
+      - openbsd
+    goarch:
+      - amd64
+      - '386'
+      - arm
+      - arm64
+      - mips
+      - mipsle
+      - mips64
+      - mips64le
+    goarm:
+      - '5'
+      - '6'
+      - '7'
+    ignore:
+      - goos: openbsd
+        goarch: arm
+        goarm: 6
+      - goos: freebsd
+        goarch: arm
+        goarm: 6
 
 archives:
-  -
-    name_template: "{{.Os}}-{{.Arch}}{{if .Arm}}v{{.Arm}}{{end}}-{{ .ProjectName }}"
+  - name_template: "{{.Os}}-{{.Arch}}{{if .Arm}}v{{.Arm}}{{end}}-{{ .ProjectName }}"
     format: tar.gz
     format_overrides:
       - goos: windows
         format: zip
 
-dockers:
-  -
-    goos: linux
-    goarch: amd64
-    goarm: ''
-    image_templates:
-      - "hacdias/webdav:latest"
-      - "hacdias/webdav:{{ .Tag }}"
-      - "hacdias/webdav:v{{ .Major }}.{{ .Minor }}"
-      - "hacdias/webdav:v{{ .Major }}"
+release:
+  github:
+    owner: hacdias
+    name: webdav
+  draft: false
+  prerelease: auto

Dockerfile

@@ -1,11 +1,24 @@
-FROM alpine:latest as certs
+FROM golang:1.22-alpine3.20 AS build
+
+ARG DOCKER_META_VERSION="untracked"
+
 RUN apk --update add ca-certificates
 
+WORKDIR /webdav/
+
+COPY ./go.mod ./
+COPY ./go.sum ./
+RUN go mod download
+
+COPY . /webdav/
+RUN go build -o main -ldflags="-X 'github.com/hacdias/webdav/v4/cmd.version=$DOCKER_META_VERSION'" .
+
 FROM scratch
-COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+
+COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+COPY --from=build /webdav/main /bin/webdav
 
 EXPOSE 80
 
-COPY webdav /webdav
-
-ENTRYPOINT [ "/webdav" ]
+ENTRYPOINT [ "webdav" ]
+CMD [ "-p", "80" ]

README.md

@@ -1,8 +1,10 @@
 # webdav
 
-[![Build](https://img.shields.io/circleci/project/github/hacdias/webdav/master.svg?style=flat-square)](https://circleci.com/gh/hacdias/webdav)
 [![Go Report Card](https://goreportcard.com/badge/github.com/hacdias/webdav?style=flat-square)](https://goreportcard.com/report/hacdias/webdav)
 [![Version](https://img.shields.io/github/release/hacdias/webdav.svg?style=flat-square)](https://github.com/hacdias/webdav/releases/latest)
+[![Docker Pulls](https://img.shields.io/docker/pulls/hacdias/webdav?style=flat-square)](https://hub.docker.com/r/hacdias/webdav)
+
+A simple and standalone [WebDAV](https://en.wikipedia.org/wiki/WebDAV) server.
 
 ## Install
 
@@ -10,7 +12,7 @@ Please refer to the [Releases page](https://github.com/hacdias/webdav/releases)
 
 ## Usage
 
-```webdav``` command line interface is really easy to use so you can easily create a WebDAV server for your own user. By default, it runs on a random free port and supports JSON, YAML and TOML configuration. An example of a YAML configuration with the default configurations:
+`webdav` command line interface is really easy to use so you can easily create a WebDAV server for your own user. By default, it runs on a random free port and supports JSON, YAML and TOML configuration. An example of a YAML configuration with the default configurations:
 
 ```yaml
 # Server related settings
@@ -20,12 +22,28 @@ auth: true
 tls: false
 cert: cert.pem
 key: key.pem
+prefix: /
+debug: false
 
 # Default user settings (will be merged)
 scope: .
 modify: true
 rules: []
 
+# CORS configuration
+cors:
+  enabled: true
+  credentials: true
+  allowed_headers:
+    - Depth
+  allowed_hosts:
+    - http://localhost:8080
+  allowed_methods:
+    - GET
+  exposed_headers:
+    - Content-Length
+    - Content-Range
+
 users:
   - username: admin
     password: admin
@@ -36,11 +54,13 @@ users:
     password: "{env}ENV_PASSWORD"
   - username: basic
     password: basic
-    modify:   false
+    modify: false
     rules:
       - regex: false
         allow: false
         path: /some/file
+      - path: /public/access/
+        modify: true
 ```
 
 There are more ways to customize how you run WebDAV through flags and environment variables. Please run `webdav --help` for more information on that.
@@ -49,6 +69,31 @@ There are more ways to customize how you run WebDAV through flags and environmen
 
 An example of how to use this with `systemd` is on [webdav.service.example](/webdav.service.example).
 
+### CORS
+
+The `allowed_*` properties are optional, the default value for each of them will be `*`. `exposed_headers` is optional as well, but is not set if not defined. Setting `credentials` to `true` will allow you to:
+
+1. Use `withCredentials = true` in javascript.
+2. Use the `username:password@host` syntax.
+
+### Reverse Proxy Service
+When you use a reverse proxy implementation like `Nginx` or `Apache`, please note the following fields to avoid causing `502` errors
+
+```nginx
+location / {
+  proxy_pass http://127.0.0.1:8080;
+  proxy_set_header X-Real-IP $remote_addr;
+  proxy_set_header REMOTE-HOST $remote_addr;
+  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+  proxy_set_header Host $http_host;
+  proxy_redirect off;
+}
+```
+
+## Contributing
+
+Feel free to open an issue or a pull request.
+
 ## License
 
-MIT © [Henrique Dias](https://hacdias.com)
+[MIT License](LICENSE) © [Henrique Dias](https://hacdias.com)

SECURITY.md

@@ -0,0 +1,8 @@
+# Security Policy
+
+## Reporting a Vulnerability
+
+Please report security issues to:
+msaa1990 [at] gmail [dot com]
+
+cc: hacdias [at] gmail [dot com]

cmd/cmd.go

@@ -9,4 +9,4 @@ func Execute() {
 	if err := rootCmd.Execute(); err != nil {
 		log.Fatal(err)
 	}
-}
+}

cmd/config.go

@@ -1,151 +0,0 @@
-package cmd
-
-import (
-	"errors"
-	"log"
-	"os"
-	"regexp"
-	"strings"
-
-	"github.com/hacdias/webdav/webdav"
-	"github.com/spf13/pflag"
-	v "github.com/spf13/viper"
-	wd "golang.org/x/net/webdav"
-)
-
-func parseRules(raw []interface{}) []*webdav.Rule {
-	rules := []*webdav.Rule{}
-
-	for _, v := range raw {
-		if r, ok := v.(map[interface{}]interface{}); ok {
-			rule := &webdav.Rule{
-				Regex: false,
-				Allow: false,
-				Path:  "",
-			}
-
-			if regex, ok := r["regex"].(bool); ok {
-				rule.Regex = regex
-			}
-
-			if allow, ok := r["allow"].(bool); ok {
-				rule.Allow = allow
-			}
-
-			path, ok := r["path"].(string)
-			if !ok {
-				continue
-			}
-
-			if rule.Regex {
-				rule.Regexp = regexp.MustCompile(path)
-			} else {
-				rule.Path = path
-			}
-
-			rules = append(rules, rule)
-		}
-	}
-
-	return rules
-}
-
-func loadFromEnv(v string) (string, error) {
-	v = strings.TrimPrefix(v, "{env}")
-	if v == "" {
-		return "", errors.New("no environment variable specified")
-	}
-
-	v = os.Getenv(v)
-	if v == "" {
-		return "", errors.New("the environment variable is empty")
-	}
-
-	return v, nil
-}
-
-func parseUsers(raw []interface{}, c *webdav.Config) {
-	var err error
-	for _, v := range raw {
-		if u, ok := v.(map[interface{}]interface{}); ok {
-			username, ok := u["username"].(string)
-			if !ok {
-				log.Fatal("user needs an username")
-			}
-
-			if strings.HasPrefix(username, "{env}") {
-				username, err = loadFromEnv(username)
-				checkErr(err)
-			}
-
-			password, ok := u["password"].(string)
-			if !ok {
-				password = ""
-			}
-
-			if strings.HasPrefix(password, "{env}") {
-				password, err = loadFromEnv(password)
-				checkErr(err)
-			}
-
-			user := &webdav.User{
-				Username: username,
-				Password: password,
-				Scope:    c.User.Scope,
-				Modify:   c.User.Modify,
-				Rules:    c.User.Rules,
-			}
-
-			if scope, ok := u["scope"].(string); ok {
-				user.Scope = scope
-			}
-
-			if modify, ok := u["modify"].(bool); ok {
-				user.Modify = modify
-			}
-
-			if rules, ok := u["rules"].([]interface{}); ok {
-				user.Rules = parseRules(rules)
-			}
-
-			user.Handler = &wd.Handler{
-				FileSystem: wd.Dir(user.Scope),
-				LockSystem: wd.NewMemLS(),
-			}
-
-			c.Users[username] = user
-		}
-	}
-}
-
-func readConfig(flags *pflag.FlagSet) *webdav.Config {
-	cfg := &webdav.Config{
-		User: &webdav.User{
-			Scope:  getOpt(flags, "scope"),
-			Modify: getOptB(flags, "modify"),
-			Rules:  []*webdav.Rule{},
-			Handler: &wd.Handler{
-				FileSystem: wd.Dir(getOpt(flags, "scope")),
-				LockSystem: wd.NewMemLS(),
-			},
-		},
-		Auth:  getOptB(flags, "auth"),
-		Users: map[string]*webdav.User{},
-	}
-
-	rawRules := v.Get("rules")
-	if rules, ok := rawRules.([]interface{}); ok {
-		cfg.User.Rules = parseRules(rules)
-	}
-
-	rawUsers := v.Get("users")
-	if users, ok := rawUsers.([]interface{}); ok {
-		parseUsers(users, cfg)
-	}
-
-	if len(cfg.Users) != 0 && !cfg.Auth {
-		log.Print("Users will be ignored due to auth=false")
-	}
-
-	return cfg
-}

cmd/root.go

@@ -1,30 +1,32 @@
 package cmd
 
 import (
+	"errors"
 	"fmt"
-	"log"
 	"net"
 	"net/http"
+	"os"
+	"os/signal"
 	"strings"
+	"syscall"
 
+	"github.com/hacdias/webdav/v4/lib"
 	"github.com/spf13/cobra"
-	v "github.com/spf13/viper"
-)
-
-var (
-	cfgFile string
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
 )
 
 func init() {
-	cobra.OnInitialize(initConfig)
-
 	flags := rootCmd.Flags()
-	flags.StringVarP(&cfgFile, "config", "c", "", "config file path")
-	flags.BoolP("tls", "t", false, "enable tls")
-	flags.String("cert", "cert.pem", "TLS certificate")
-	flags.String("key", "key.pem", "TLS key")
-	flags.StringP("address", "a", "0.0.0.0", "address to listen to")
-	flags.StringP("port", "p", "0", "port to listen to")
+	flags.StringP("config", "c", "", "config file path")
+	flags.BoolP("tls", "t", false, "enable TLS")
+	flags.Bool("auth", false, "enable authentication")
+	flags.String("cert", "cert.pem", "path to TLS certificate")
+	flags.String("key", "key.pem", "path to TLS key")
+	flags.StringP("address", "a", "0.0.0.0", "address to listen on")
+	flags.StringP("port", "p", "0", "port to listen on")
+	flags.StringP("prefix", "P", "/", "URL path prefix")
+	flags.String("log_format", "console", "logging format")
 }
 
 var rootCmd = &cobra.Command{
@@ -46,53 +48,98 @@ The precedence of the configuration values are as follows:
 The environment variables are prefixed by "WD_" followed by the option
 name in caps. So to set "cert" via an env variable, you should
 set WD_CERT.`,
-	Run: func(cmd *cobra.Command, args []string) {
+	RunE: func(cmd *cobra.Command, args []string) error {
 		flags := cmd.Flags()
 
-		cfg := readConfig(flags)
+		cfgFilename, _ := flags.GetString("config")
 
-		// Builds the address and a listener.
-		laddr := getOpt(flags, "address") + ":" + getOpt(flags, "port")
-		listener, err := net.Listen("tcp", laddr)
+		cfg, err := lib.ParseConfig(cfgFilename, flags)
 		if err != nil {
-			log.Fatal(err)
+			return err
 		}
 
-		// Tell the user the port in which is listening.
-		fmt.Println("Listening on", listener.Addr().String())
-
-		// Starts the server.
-		if getOptB(flags, "tls") {
-			if err := http.ServeTLS(listener, cfg, getOpt(flags, "cert"), getOpt(flags, "key")); err != nil {
-				log.Fatal(err)
-			}
-		} else {
-			if err := http.Serve(listener, cfg); err != nil {
-				log.Fatal(err)
-			}
+		// Create HTTP handler from the config
+		handler, err := lib.NewHandler(cfg)
+		if err != nil {
+			return err
 		}
+
+		// Setup the logger based on the configuration
+		err = setupLogger(cfg)
+		if err != nil {
+			return err
+		}
+
+		defer func() {
+			// Flush the logger at the end
+			_ = zap.L().Sync()
+		}()
+
+		// Build listener
+		listener, err := getListener(cfg)
+		if err != nil {
+			return err
+		}
+
+		// Trap exiting signals
+		quit := make(chan os.Signal, 1)
+
+		go func() {
+			zap.L().Info("listening", zap.String("address", listener.Addr().String()))
+
+			var err error
+			if cfg.TLS {
+				err = http.ServeTLS(listener, handler, cfg.Cert, cfg.Key)
+			} else {
+				err = http.Serve(listener, handler)
+			}
+
+			if err != nil && !errors.Is(err, http.ErrServerClosed) {
+				zap.L().Error("failed to start server", zap.Error(err))
+			}
+
+			quit <- os.Interrupt
+		}()
+
+		signal.Notify(quit, os.Interrupt, syscall.SIGTERM)
+		signal := <-quit
+
+		zap.L().Info("caught signal, shutting down", zap.Stringer("signal", signal))
+		_ = listener.Close()
+
+		return nil
 	},
 }
 
-func initConfig() {
-	if cfgFile == "" {
-		v.AddConfigPath(".")
-		v.AddConfigPath("/etc/webdav/")
-		v.SetConfigName("config")
+func getListener(cfg *lib.Config) (net.Listener, error) {
+	var (
+		address string
+		network string
+	)
+
+	if strings.HasPrefix(cfg.Address, "unix:") {
+		address = cfg.Address[5:]
+		network = "unix"
 	} else {
-		v.SetConfigFile(cfgFile)
+		address = fmt.Sprintf("%s:%d", cfg.Address, cfg.Port)
+		network = "tcp"
 	}
 
-	v.SetEnvPrefix("WD")
-	v.AutomaticEnv()
-	v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+	return net.Listen(network, address)
+}
 
-	if err := v.ReadInConfig(); err != nil {
-		if _, ok := err.(v.ConfigParseError); ok {
-			panic(err)
-		}
-		cfgFile = "No config file used"
-	} else {
-		cfgFile = "Using config file: " + v.ConfigFileUsed()
+func setupLogger(cfg *lib.Config) error {
+	loggerConfig := zap.NewProductionConfig()
+	loggerConfig.DisableCaller = true
+	if cfg.Debug {
+		loggerConfig.Level = zap.NewAtomicLevelAt(zap.DebugLevel)
 	}
+	loggerConfig.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
+	loggerConfig.Encoding = cfg.LogFormat
+	logger, err := loggerConfig.Build()
+	if err != nil {
+		return err
+	}
+	zap.ReplaceGlobals(logger)
+	return nil
 }

cmd/version.go

@@ -6,14 +6,14 @@ import (
 	"github.com/spf13/cobra"
 )
 
-var version = "(untracked)"
+var version = "untracked"
 
 func init() {
 	rootCmd.AddCommand(&cobra.Command{
 		Use:   "version",
 		Short: "Print the version number",
 		Run: func(cmd *cobra.Command, args []string) {
-			fmt.Println("WebDAV version " + version)
+			fmt.Printf("WebDAV version: %s\n", version)
 		},
 	})
 }

cmd/viper.go

@@ -1,55 +0,0 @@
-package cmd
-
-import (
-	"log"
-
-	"github.com/spf13/pflag"
-	v "github.com/spf13/viper"
-)
-
-// getOption returns a parameter as a string.
-//
-// NOTE: we could simply bind the flags to viper and use IsSet.
-// Although there is a bug on Viper that always returns true on IsSet
-// if a flag is binded. Our alternative way is to manually check
-// the flag and then the value from env/config/gotten by viper.
-// https://github.com/spf13/viper/pull/331
-func getOpt(flags *pflag.FlagSet, key string) string {
-	value, _ := flags.GetString(key)
-
-	// If set on Flags, use it.
-	if flags.Changed(key) {
-		return value
-	}
-
-	// If set through viper (env, config), return it.
-	if v.IsSet(key) {
-		return v.GetString(key)
-	}
-
-	// Otherwise use default value on flags.
-	return value
-}
-
-func getOptB(flags *pflag.FlagSet, key string) bool {
-	value, _ := flags.GetBool(key)
-
-	// If set on Flags, use it.
-	if flags.Changed(key) {
-		return value
-	}
-
-	// If set through viper (env, config), return it.
-	if v.IsSet(key) {
-		return v.GetBool(key)
-	}
-
-	// Otherwise use default value on flags.
-	return value
-}
-
-func checkErr(err error) {
-	if err != nil {
-		log.Fatal(err)
-	}
-}

go.mod

@@ -1,13 +1,39 @@
-module github.com/hacdias/webdav
+module github.com/hacdias/webdav/v4
 
-go 1.12
+go 1.22
 
 require (
-	github.com/BurntSushi/toml v0.3.1 // indirect
-	github.com/inconshreveable/mousetrap v1.0.0 // indirect
-	github.com/spf13/cobra v0.0.3
-	github.com/spf13/pflag v1.0.3
-	github.com/spf13/viper v1.3.2
-	golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529
-	golang.org/x/net v0.0.0-20190509222800-a4d6f7feada5
+	github.com/rs/cors v1.11.0
+	github.com/spf13/cobra v1.8.1
+	github.com/spf13/pflag v1.0.5
+	github.com/spf13/viper v1.19.0
+	github.com/stretchr/testify v1.9.0
+	go.uber.org/zap v1.27.0
+	golang.org/x/crypto v0.25.0
+	golang.org/x/net v0.27.0
 )
+
+require (
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/fsnotify/fsnotify v1.7.0 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/sagikazarmark/locafero v0.6.0 // indirect
+	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
+	github.com/sourcegraph/conc v0.3.0 // indirect
+	github.com/spf13/afero v1.11.0 // indirect
+	github.com/spf13/cast v1.6.0 // indirect
+	github.com/subosito/gotenv v1.6.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	golang.org/x/exp v0.0.0-20240716175740-e3f259677ff7 // indirect
+	golang.org/x/sys v0.22.0 // indirect
+	golang.org/x/text v0.16.0 // indirect
+	gopkg.in/ini.v1 v1.67.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
+
+retract v4.1.0

go.sum

@@ -1,55 +1,84 @@
-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
-github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
-github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
-github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
-github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
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+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
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 github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=
 github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
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+github.com/subosito/gotenv v1.6.0/go.mod h1:Dk4QP5c2W3ibzajGcXpNraDfq2IrhjMIvMSWPKKo0FU=
+go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
+go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
+go.uber.org/multierr v1.11.0 h1:blXXJkSxSSfBVBlC76pxqeO+LN3aDfLQo+309xJstO0=
+go.uber.org/multierr v1.11.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
+go.uber.org/zap v1.27.0 h1:aJMhYGrd5QSmlpLMr2MftRKl7t8J8PTZPA732ud/XR8=
+go.uber.org/zap v1.27.0/go.mod h1:GB2qFLM7cTU87MWRP2mPIjqfIDnGu+VIO4V/SdhGo2E=
+golang.org/x/crypto v0.25.0 h1:ypSNr+bnYL2YhwoMt2zPxHFmbAN1KZs/njMG3hxUp30=
+golang.org/x/crypto v0.25.0/go.mod h1:T+wALwcMOSE0kXgUAnPAHqTLW+XHgcELELW8VaDgm/M=
+golang.org/x/exp v0.0.0-20240716175740-e3f259677ff7 h1:wDLEX9a7YQoKdKNQt88rtydkqDxeGaBUTnIYc3iG/mA=
+golang.org/x/exp v0.0.0-20240716175740-e3f259677ff7/go.mod h1:M4RDyNAINzryxdtnbRXRL/OHtkFuWGRjvuhBJpk2IlY=
+golang.org/x/net v0.27.0 h1:5K3Njcw06/l2y9vpGCSdcxWOYHOUk3dVNGDXN+FvAys=
+golang.org/x/net v0.27.0/go.mod h1:dDi0PyhWNoiUOrAS8uXv/vnScO4wnHQO4mj9fn/RytE=
+golang.org/x/sys v0.22.0 h1:RI27ohtqKCnwULzJLqkv897zojh5/DwS/ENaMzUOaWI=
+golang.org/x/sys v0.22.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.16.0 h1:a94ExnEXNtEwYLGJSIUxnWoxoRz/ZcCsV63ROupILh4=
+golang.org/x/text v0.16.0/go.mod h1:GhwF1Be+LQoKShO3cGOHzqOgRrGaYc9AvblQOmPVHnI=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/ini.v1 v1.67.0 h1:Dgnx+6+nfE+IfzjUEISNeydPJh9AXNNsWbGP9KzCsOA=
+gopkg.in/ini.v1 v1.67.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

lib/config.go

@@ -0,0 +1,153 @@
+package lib
+
+import (
+	"errors"
+	"fmt"
+	"path/filepath"
+	"strings"
+
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+)
+
+type Config struct {
+	Permissions `mapstructure:",squash"`
+	Debug       bool
+	Address     string
+	Port        int
+	TLS         bool
+	Cert        string
+	Key         string
+	Prefix      string
+	NoSniff     bool
+	LogFormat   string
+	Auth        bool
+	CORS        CORS
+	Users       []User
+}
+
+func ParseConfig(filename string, flags *pflag.FlagSet) (*Config, error) {
+	v := viper.New()
+
+	// Configure flags bindings
+	if flags != nil {
+		err := v.BindPFlags(flags)
+		if err != nil {
+			return nil, err
+		}
+
+		err = v.BindPFlag("LogFormat", flags.Lookup("log_format"))
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	// Configuration file settings
+	v.AddConfigPath(".")
+	v.AddConfigPath("/etc/webdav/")
+	v.SetConfigName("config")
+	if filename != "" {
+		v.SetConfigFile(filename)
+	}
+
+	// Environment settings
+	v.SetEnvPrefix("wd")
+	v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+	v.AutomaticEnv()
+
+	// Defaults
+	v.SetDefault("CORS.AllowedHeaders", []string{"*"})
+	v.SetDefault("CORS.AllowedHosts", []string{"*"})
+	v.SetDefault("CORS.AllowedMethods", []string{"*"})
+
+	// Read and unmarshal configuration
+	err := v.ReadInConfig()
+	if err != nil {
+		if _, ok := err.(viper.ConfigFileNotFoundError); !ok {
+			return nil, err
+		}
+	}
+
+	cfg := &Config{}
+	err = v.Unmarshal(cfg)
+	if err != nil {
+		return nil, err
+	}
+
+	// Cascade user settings
+	for i := range cfg.Users {
+		if !v.IsSet(fmt.Sprintf("Users.%d.Scope", i)) {
+			cfg.Users[i].Scope = cfg.Scope
+		}
+
+		if !v.IsSet(fmt.Sprintf("Users.%d.Modify", i)) {
+			cfg.Users[i].Modify = cfg.Modify
+		}
+
+		if !v.IsSet(fmt.Sprintf("Users.%d.Rules", i)) {
+			cfg.Users[i].Rules = cfg.Rules
+		}
+	}
+
+	err = cfg.Validate()
+	if err != nil {
+		return nil, err
+	}
+
+	return cfg, nil
+}
+
+func (c *Config) Validate() error {
+	var err error
+
+	if c.Auth && len(c.Users) == 0 {
+		return errors.New("invalid config: auth cannot be enabled without users")
+	}
+
+	if !c.Auth && len(c.Users) != 0 {
+		return errors.New("invalid config: auth cannot be disabled with users defined")
+	}
+
+	if c.TLS {
+		if c.Cert == "" {
+			return errors.New("invalid config: Cert must be defined if TLS is activated")
+		}
+
+		if c.Key == "" {
+			return errors.New("invalid config: Key must be defined if TLS is activated")
+		}
+
+		c.Cert, err = filepath.Abs(c.Cert)
+		if err != nil {
+			return fmt.Errorf("invalid config: %w", err)
+		}
+
+		c.Key, err = filepath.Abs(c.Key)
+		if err != nil {
+			return fmt.Errorf("invalid config: %w", err)
+		}
+	}
+
+	err = c.Permissions.Validate()
+	if err != nil {
+		return fmt.Errorf("invalid config: %w", err)
+	}
+
+	for _, u := range c.Users {
+		err := u.Validate()
+		if err != nil {
+			return fmt.Errorf("invalid config: %w", err)
+		}
+	}
+
+	return nil
+}
+
+type CORS struct {
+	Enabled        bool
+	Credentials    bool
+	AllowedHeaders []string
+	AllowedHosts   []string
+	AllowedMethods []string
+	ExposedHeaders []string
+}

lib/config_test.go

@@ -0,0 +1,71 @@
+package lib
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func writeAndParseConfig(t *testing.T, content string) *Config {
+	tmpDir := t.TempDir()
+	tmpFile := filepath.Join(tmpDir, "config.yml")
+
+	err := os.WriteFile(tmpFile, []byte(content), 0666)
+	require.NoError(t, err)
+
+	cfg, err := ParseConfig(tmpFile, nil)
+	require.NoError(t, err)
+
+	return cfg
+}
+
+func TestConfigDefaults(t *testing.T) {
+	t.Parallel()
+
+	cfg := writeAndParseConfig(t, "")
+	require.NoError(t, cfg.Validate())
+
+	require.EqualValues(t, []string{"*"}, cfg.CORS.AllowedHeaders)
+	require.EqualValues(t, []string{"*"}, cfg.CORS.AllowedHosts)
+	require.EqualValues(t, []string{"*"}, cfg.CORS.AllowedMethods)
+}
+
+func TestConfigCascade(t *testing.T) {
+	t.Parallel()
+
+	content := `
+auth: true
+scope: /
+modify: true
+rules:
+  - path: /public/access/
+    modify: true
+
+users:
+  - username: admin
+    password: admin
+  - username: basic
+    password: basic
+    scope: /basic
+    modify: false
+    rules: []`
+
+	cfg := writeAndParseConfig(t, content)
+	require.NoError(t, cfg.Validate())
+
+	require.True(t, cfg.Modify)
+	require.Equal(t, "/", cfg.Scope)
+	require.Len(t, cfg.Rules, 1)
+
+	require.Len(t, cfg.Users, 2)
+
+	require.True(t, cfg.Users[0].Modify)
+	require.Equal(t, "/", cfg.Users[0].Scope)
+	require.Len(t, cfg.Users[0].Rules, 1)
+
+	require.False(t, cfg.Users[1].Modify)
+	require.Equal(t, "/basic", cfg.Users[1].Scope)
+	require.Len(t, cfg.Users[1].Rules, 0)
+}

lib/files.go

@@ -0,0 +1,82 @@
+package lib
+
+import (
+	"context"
+	"mime"
+	"os"
+	"path"
+
+	"golang.org/x/net/webdav"
+)
+
+type Dir struct {
+	webdav.Dir
+	noSniff bool
+}
+
+func (d Dir) Stat(ctx context.Context, name string) (os.FileInfo, error) {
+	// Skip wrapping if NoSniff is off
+	if !d.noSniff {
+		return d.Dir.Stat(ctx, name)
+	}
+
+	info, err := d.Dir.Stat(ctx, name)
+	if err != nil {
+		return nil, err
+	}
+
+	return noSniffFileInfo{info}, nil
+}
+
+func (d Dir) OpenFile(ctx context.Context, name string, flag int, perm os.FileMode) (webdav.File, error) {
+	// Skip wrapping if NoSniff is off
+	if !d.noSniff {
+		return d.Dir.OpenFile(ctx, name, flag, perm)
+	}
+
+	file, err := d.Dir.OpenFile(ctx, name, flag, perm)
+	if err != nil {
+		return nil, err
+	}
+
+	return noSniffFile{File: file}, nil
+}
+
+type noSniffFileInfo struct {
+	os.FileInfo
+}
+
+func (w noSniffFileInfo) ContentType(ctx context.Context) (contentType string, err error) {
+	if mimeType := mime.TypeByExtension(path.Ext(w.FileInfo.Name())); mimeType != "" {
+		// We can figure out the mime from the extension.
+		return mimeType, nil
+	} else {
+		// We can't figure out the mime type without sniffing, call it an octet stream.
+		return "application/octet-stream", nil
+	}
+}
+
+type noSniffFile struct {
+	webdav.File
+}
+
+func (f noSniffFile) Stat() (os.FileInfo, error) {
+	info, err := f.File.Stat()
+	if err != nil {
+		return nil, err
+	}
+
+	return noSniffFileInfo{info}, nil
+}
+
+func (f noSniffFile) Readdir(count int) (fis []os.FileInfo, err error) {
+	fis, err = f.File.Readdir(count)
+	if err != nil {
+		return nil, err
+	}
+
+	for i := range fis {
+		fis[i] = noSniffFileInfo{fis[i]}
+	}
+	return fis, nil
+}

lib/handler.go

@@ -0,0 +1,133 @@
+package lib
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/rs/cors"
+	"go.uber.org/zap"
+	"golang.org/x/net/webdav"
+)
+
+type handlerUser struct {
+	User
+	webdav.Handler
+}
+
+type Handler struct {
+	*Config
+	user  *handlerUser
+	users map[string]*handlerUser
+}
+
+func NewHandler(c *Config) (http.Handler, error) {
+	h := &Handler{
+		user: &handlerUser{
+			User: User{
+				Permissions: c.Permissions,
+			},
+			Handler: webdav.Handler{
+				Prefix: c.Prefix,
+				FileSystem: Dir{
+					Dir:     webdav.Dir(c.Scope),
+					noSniff: c.NoSniff,
+				},
+				LockSystem: webdav.NewMemLS(),
+			},
+		},
+		users: map[string]*handlerUser{},
+	}
+
+	for _, u := range c.Users {
+		h.users[u.Username] = &handlerUser{
+			User: u,
+			Handler: webdav.Handler{
+				Prefix: c.Prefix,
+				FileSystem: Dir{
+					Dir:     webdav.Dir(u.Scope),
+					noSniff: c.NoSniff,
+				},
+				LockSystem: webdav.NewMemLS(),
+			},
+		}
+	}
+
+	if c.CORS.Enabled {
+		return cors.New(cors.Options{
+			AllowCredentials:   c.CORS.Credentials,
+			AllowedOrigins:     c.CORS.AllowedHosts,
+			AllowedMethods:     c.CORS.AllowedMethods,
+			AllowedHeaders:     c.CORS.AllowedHeaders,
+			OptionsPassthrough: false,
+		}).Handler(h), nil
+	}
+
+	return h, nil
+}
+
+// ServeHTTP determines if the request is for this plugin, and if all prerequisites are met.
+func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	user := h.user
+
+	// Authentication
+	if h.Auth {
+		w.Header().Set("WWW-Authenticate", `Basic realm="Restricted"`)
+
+		// Gets the correct user for this request.
+		username, password, ok := r.BasicAuth()
+		zap.L().Info("login attempt", zap.String("username", username), zap.String("remote_address", r.RemoteAddr))
+		if !ok {
+			http.Error(w, "Not authorized", http.StatusUnauthorized)
+			return
+		}
+
+		user, ok = h.users[username]
+		if !ok {
+			http.Error(w, "Not authorized", http.StatusUnauthorized)
+			return
+		}
+
+		if !user.checkPassword(password) {
+			zap.L().Info("invalid password", zap.String("username", username), zap.String("remote_address", r.RemoteAddr))
+			http.Error(w, "Not authorized", http.StatusUnauthorized)
+			return
+		}
+
+		zap.L().Info("user authorized", zap.String("username", username))
+	}
+
+	// Checks for user permissions relatively to this PATH.
+	allowed := user.Allowed(r)
+
+	zap.L().Debug("allowed & method & path", zap.Bool("allowed", allowed), zap.String("method", r.Method), zap.String("path", r.URL.Path))
+
+	if !allowed {
+		w.WriteHeader(http.StatusForbidden)
+		return
+	}
+
+	if r.Method == "HEAD" {
+		w = newResponseWriterNoBody(w)
+	}
+
+	// Excerpt from RFC4918, section 9.4:
+	//
+	// 		GET, when applied to a collection, may return the contents of an
+	//		"index.html" resource, a human-readable view of the contents of
+	//		the collection, or something else altogether.
+	//
+	// Get, when applied to collection, will return the same as PROPFIND method.
+	if r.Method == "GET" && strings.HasPrefix(r.URL.Path, user.Prefix) {
+		info, err := user.FileSystem.Stat(r.Context(), strings.TrimPrefix(r.URL.Path, user.Prefix))
+		if err == nil && info.IsDir() {
+			r.Method = "PROPFIND"
+
+			if r.Header.Get("Depth") == "" {
+				r.Header.Add("Depth", "1")
+			}
+		}
+	}
+
+	// Runs the WebDAV.
+	user.ServeHTTP(w, r)
+}

lib/permissions.go

@@ -0,0 +1,85 @@
+package lib
+
+import (
+	"fmt"
+	"net/http"
+	"regexp"
+	"strings"
+)
+
+var readMethods = []string{
+	http.MethodGet,
+	http.MethodHead,
+	http.MethodOptions,
+	"PROPFIND",
+}
+
+type Rule struct {
+	Regex  bool
+	Allow  bool
+	Modify bool
+	Path   string
+	// TODO: remove Regex and replace by this. It encodes
+	Regexp *regexp.Regexp `mapstructure:"-"`
+}
+
+func (r *Rule) Validate() error {
+	if r.Regex {
+		rp, err := regexp.Compile(r.Path)
+		if err != nil {
+			return fmt.Errorf("invalid rule: %w", err)
+		}
+		r.Regexp = rp
+		r.Path = ""
+	}
+
+	return nil
+}
+
+// Matches checks if [Rule] matches the given path.
+func (r *Rule) Matches(path string) bool {
+	if r.Regex {
+		return r.Regexp.MatchString(path)
+	}
+
+	return strings.HasPrefix(path, r.Path)
+}
+
+type Permissions struct {
+	Scope  string
+	Modify bool
+	Rules  []*Rule
+}
+
+// Allowed checks if the user has permission to access a directory/file
+func (p Permissions) Allowed(r *http.Request) bool {
+	// Determine whether or not it is a read or write request.
+	readRequest := false
+	for _, method := range readMethods {
+		if r.Method == method {
+			readRequest = true
+			break
+		}
+	}
+
+	// Go through rules beginning from the last one.
+	for i := len(p.Rules) - 1; i >= 0; i-- {
+		rule := p.Rules[i]
+
+		if rule.Matches(r.URL.Path) {
+			return rule.Allow && (readRequest || rule.Modify)
+		}
+	}
+
+	return readRequest || p.Modify
+}
+
+func (p *Permissions) Validate() error {
+	for _, r := range p.Rules {
+		if err := r.Validate(); err != nil {
+			return fmt.Errorf("invalid permissions: %w", err)
+		}
+	}
+
+	return nil
+}

lib/response_writer.go

@@ -0,0 +1,27 @@
+package lib
+
+import "net/http"
+
+var _ http.ResponseWriter = responseWriterNoBody{}
+
+// responseWriterNoBody is a wrapper used to suppress the body of the response
+// to a request. Mainly used for HEAD requests.
+type responseWriterNoBody struct {
+	http.ResponseWriter
+}
+
+// newResponseWriterNoBody creates a new responseWriterNoBody.
+func newResponseWriterNoBody(w http.ResponseWriter) *responseWriterNoBody {
+	return &responseWriterNoBody{w}
+}
+
+// Write suppress the body.
+func (w responseWriterNoBody) Write(data []byte) (int, error) {
+	return 0, nil
+}
+
+// WriteHeader writes the header to the http.ResponseWriter.
+func (w responseWriterNoBody) WriteHeader(statusCode int) {
+	w.Header().Del("Content-Length")
+	w.ResponseWriter.WriteHeader(statusCode)
+}

lib/user.go

@@ -0,0 +1,52 @@
+package lib
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+type User struct {
+	Permissions `mapstructure:",squash"`
+	Username    string
+	Password    string
+}
+
+func (u User) checkPassword(input string) bool {
+	if strings.HasPrefix(u.Password, "{bcrypt}") {
+		savedPassword := strings.TrimPrefix(u.Password, "{bcrypt}")
+		return bcrypt.CompareHashAndPassword([]byte(savedPassword), []byte(input)) == nil
+	}
+
+	return u.Password == input
+}
+
+func (u *User) Validate() error {
+	if u.Username == "" {
+		return errors.New("invalid user: username must be set")
+	}
+
+	if u.Password == "" {
+		return fmt.Errorf("invalid user %q: password must be set", u.Username)
+	} else if strings.HasPrefix(u.Password, "{env}") {
+
+		env := strings.TrimPrefix(u.Password, "{env}")
+		if env == "" {
+			return fmt.Errorf("invalid user %q: password environment variable not set", u.Username)
+		}
+
+		u.Password = os.Getenv(env)
+		if u.Password == "" {
+			return fmt.Errorf("invalid user %q: password environment variable is empty", u.Username)
+		}
+	}
+
+	if err := u.Permissions.Validate(); err != nil {
+		return fmt.Errorf("invalid user %q: %w", u.Username, err)
+	}
+
+	return nil
+}

main.go

@@ -1,12 +1,9 @@
 package main
 
 import (
-	"runtime"
-
-	"github.com/hacdias/webdav/cmd"
+	"github.com/hacdias/webdav/v4/cmd"
 )
 
 func main() {
-	runtime.GOMAXPROCS(runtime.NumCPU())
 	cmd.Execute()
 }

webdav/user.go

@@ -1,48 +0,0 @@
-package webdav
-
-import (
-	"regexp"
-	"strings"
-
-	"golang.org/x/net/webdav"
-)
-
-// Rule is a dissalow/allow rule.
-type Rule struct {
-	Regex  bool
-	Allow  bool
-	Path   string
-	Regexp *regexp.Regexp
-}
-
-// User contains the settings of each user.
-type User struct {
-	Username string
-	Password string
-	Scope    string
-	Modify   bool
-	Rules    []*Rule
-	Handler  *webdav.Handler
-}
-
-// Allowed checks if the user has permission to access a directory/file
-func (u User) Allowed(url string) bool {
-	var rule *Rule
-	i := len(u.Rules) - 1
-
-	for i >= 0 {
-		rule = u.Rules[i]
-
-		if rule.Regex {
-			if rule.Regexp.MatchString(url) {
-				return rule.Allow
-			}
-		} else if strings.HasPrefix(url, rule.Path) {
-			return rule.Allow
-		}
-
-		i--
-	}
-
-	return true
-}

webdav/utils.go

@@ -1,16 +0,0 @@
-package webdav
-
-import (
-	"strings"
-
-	"golang.org/x/crypto/bcrypt"
-)
-
-func checkPassword(saved, input string) bool {
-	if strings.HasPrefix(saved, "{bcrypt}") {
-		savedPassword := strings.TrimPrefix(saved, "{bcrypt}")
-		return bcrypt.CompareHashAndPassword([]byte(savedPassword), []byte(input)) == nil
-	}
-
-	return saved == input
-}

webdav/webdav.go

@@ -1,120 +0,0 @@
-package webdav
-
-import (
-	"context"
-	"log"
-	"net/http"
-)
-
-// Config is the configuration of a WebDAV instance.
-type Config struct {
-	*User
-	Auth  bool
-	Users map[string]*User
-}
-
-// ServeHTTP determines if the request is for this plugin, and if all prerequisites are met.
-func (c *Config) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	u := c.User
-
-	if c.Auth {
-		w.Header().Set("WWW-Authenticate", `Basic realm="Restricted"`)
-
-		// Gets the correct user for this request.
-		username, password, ok := r.BasicAuth()
-		if !ok {
-			http.Error(w, "Not authorized", 401)
-			return
-		}
-
-		user, ok := c.Users[username]
-		if !ok {
-			http.Error(w, "Not authorized", 401)
-			return
-		}
-
-		if !checkPassword(user.Password, password) {
-			log.Println("Wrong Password for user", username)
-			http.Error(w, "Not authorized", 401)
-			return
-		}
-
-		u = user
-	} else {
-		// Even if Auth is disabled, we might want to get
-		// the user from the Basic Auth header. Useful for Caddy
-		// plugin implementation.
-		username, _, ok := r.BasicAuth()
-		if ok {
-			if user, ok := c.Users[username]; ok {
-				u = user
-			}
-		}
-	}
-
-	// Checks for user permissions relatively to this PATH.
-	if !u.Allowed(r.URL.Path) {
-		w.WriteHeader(http.StatusForbidden)
-		return
-	}
-
-	if r.Method == "HEAD" {
-		w = newResponseWriterNoBody(w)
-	}
-
-	// If this request modified the files and the user doesn't have permission
-	// to do so, return forbidden.
-	if (r.Method == "PUT" || r.Method == "POST" || r.Method == "MKCOL" ||
-		r.Method == "DELETE" || r.Method == "COPY" || r.Method == "MOVE") &&
-		!u.Modify {
-		w.WriteHeader(http.StatusForbidden)
-		return
-	}
-
-	// Excerpt from RFC4918, section 9.4:
-	//
-	// 		GET, when applied to a collection, may return the contents of an
-	//		"index.html" resource, a human-readable view of the contents of
-	//		the collection, or something else altogether.
-	//
-	// Get, when applied to collection, will return the same as PROPFIND method.
-	if r.Method == "GET" {
-		info, err := u.Handler.FileSystem.Stat(context.TODO(), r.URL.Path)
-		if err == nil && info.IsDir() {
-			r.Method = "PROPFIND"
-
-			if r.Header.Get("Depth") == "" {
-				r.Header.Add("Depth", "1")
-			}
-		}
-	}
-
-	// Runs the WebDAV.
-	u.Handler.ServeHTTP(w, r)
-}
-
-// responseWriterNoBody is a wrapper used to suprress the body of the response
-// to a request. Mainly used for HEAD requests.
-type responseWriterNoBody struct {
-	http.ResponseWriter
-}
-
-// newResponseWriterNoBody creates a new responseWriterNoBody.
-func newResponseWriterNoBody(w http.ResponseWriter) *responseWriterNoBody {
-	return &responseWriterNoBody{w}
-}
-
-// Header executes the Header method from the http.ResponseWriter.
-func (w responseWriterNoBody) Header() http.Header {
-	return w.ResponseWriter.Header()
-}
-
-// Write suprresses the body.
-func (w responseWriterNoBody) Write(data []byte) (int, error) {
-	return 0, nil
-}
-
-// WriteHeader writes the header to the http.ResponseWriter.
-func (w responseWriterNoBody) WriteHeader(statusCode int) {
-	w.ResponseWriter.WriteHeader(statusCode)
-}